JPS62117994A - Excavated soil and sand fluidizing agitator in method of shield construction - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a shield method adopted for vertical shaft and side shaft excavation, and particularly to an excavated soil flow agitation device for facilitating the discharge of excavated soil. .

[Conventional technology]

Conventionally, the shield method used for shaft and side shaft excavation has changed from manual and mechanical shield methods to mud water method and earth pressure balance method due to improvements in excavation efficiency, safety, work management, and the complexity of the target soil. It has developed into the mud shield method and the mud odor shield method. Among these, in the mud type, earth pressure type, and mud odor shield method, in order to prevent the collapse of other mountains, an excavation chamber is formed to mechanically isolate the face and the inside of the mine to consolidate the excavated soil. The excavated earth and sand in this chamber is discharged by a screw conveyor, a ribbon screw conveyor, or the like. However, the fateful issues faced by these methods include the balance between excavated soil and discharged soil in a water-retaining gravel layer containing coarse gravel, maintaining face water pressure, discharging coarse gravel, and preventing ground eruption. Regarding the issue of
The current situation is that it has not yet been fully resolved.

For example, in the Mud Enhancement Shield Method, a mud enhancement agent is injected into the excavation chamber formed by blocking the face and underground, and the excavated soil is plastically fluidized and compacted. The excavated soil is stirred by a stirring propeller or an agitator installed in the excavation chamber. Then, open the soil removal gate provided on the soil removal device,
It is discharged using a screw conveyor, etc.

However, in cases where the balance between excavated sediment and discharged sediment cannot keep up with rapid changes in the face soil quality, or
When the earth discharge gate is unavoidably opened to discharge coarse gravel, there is a problem in that the face and the mine are in communication and water pressure cannot be maintained at the face, which may lead to the risk of ground eruption. .

In order to solve this problem, a system has recently been put into practical use that uses an elastic tube pump instead of a screw conveyor as an earth removal device. As shown in FIG. 4, this is caused by the telescoping movement of an elastic tube 2.3 made of rubber that expands and contracts with the hydraulic cylinder 1 and the valve 4. This is a pump that moves an object by changing the volume inside the pipe by opening and closing the valve 5 in combination. That is,
In step (a), the hydraulic cylinder 1 contracts, the valve 5 moves to the right, and the elastic elastic tube 3 on the discharge side is contracted to discharge the conveyed material, while at the same time the elastic elastic tube 2 on the suction side is expanded. By doing so, a negative pressure is created in the tube, and the material to be transported in the storage chamber 6 is sucked into the tube. In the next stroke (B), the valve 5 is closed to prevent the backflow of the conveyed material, and at the same time, when the hydraulic cylinder 1 begins to extend, the valve 4 is closed in the 9th stroke (C) where the conveyed material begins to accumulate in the accumulation chamber 6. When the valve is opened and the contraction of the suction side telescopic pipe 2 is completed, the valve is closed again, and the following steps (a) to (c) are repeated.

In the above-mentioned elastic telescopic tube pump, one of the two valves 4 and 5 is always closed, so if this is used as an earth removal device, the face and the underground mine will always be mechanically isolated. This makes it possible to discharge the excavated earth and sand, making it easy to manage the earth face pressure and preventing ground eruptions.Also, since the coarse gravel is crushed by the valves 4 and 5, it is easy to discharge it. is also 0.

[Problem that the invention seeks to solve]

However, in the above conventional method, since the excavated earth and sand are compacted in the excavation chamber, the earth and sand in the excavation chamber may be damaged by the viscosity of the earth and sand as the seal 1 is pushed forward, and the earth and sand in the excavation chamber may be damaged by a part of the excavation cutter or the excavation chamber. This caused problems such as reduced excavation efficiency and difficulty in discharging excavated soil smoothly.

In addition, even if the soil is stirred by a stirring propeller or agitator installed in the excavation chamber, local IgLf
! t'L cannot be performed, resulting in a problem that the earth and sand in the entire excavation chamber cannot be stirred.

The present invention is intended to solve the above-mentioned problems, and aims to improve the cutting efficiency by stirring the earth and sand in the excavation chamber, and to enable smooth discharge of the excavated earth and sand. It is.

[Means for solving problems]

To this end, the excavated soil flow agitation device in the shield construction method of the present invention forms an excavation chamber between the cutter for excavation and a cutoff wall that blocks the face and the underground, and also arranges a plurality of sets of pumps on the cutoff wall. , the excavated soil in the excavation chamber is sucked in and discharged by the pump to agitate it in a fluid state.

[Effect]

The excavated earth and sand in the excavation chamber is sucked by a plurality of sets of pumps, and is ejected by applying pressure to a portion of the cutter and the chamber wall, so that the entire excavated earth and sand in the excavation chamber is stirred in a fluid state.

〔Example〕

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the excavated soil flow agitation device according to the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is a cross-sectional view taken along line B-B in FIG. Show the diagram.

An embodiment of the present invention will be described with reference to FIGS. 1 to 3. A shield device 1o includes an excavating cutter 1 driven by an electric motor 11 and held by a rotating plate 12.
3, and is also provided with a blocking wall 14 for blocking the face and the inside of the mine, and an excavation chamber 15 is formed between the blocking wall 14 and the excavation cutter 13 to maintain the excavated soil in a compacted state. There is. Furthermore, as shown in FIG. 3, a plurality of sets of elastic extensible pumps 16 are disposed concentrically on the inside and outside of the wall 14 on the blocking wall 14, and an excavating A plurality of electric motors 11 for driving the cutter
is provided, and furthermore, a blocking wall 1 is provided from inside the excavation chamber 15.
Elastic telescopic pump 17 for discharging excavated earth and sand through 4.
is installed. 18 indicates a sludge supply pipe.

To explain the operation of the present invention, the excavation cutter 13 is rotated by a plurality of electric motors 11, 11, .
As the mud enhancer is forced into the face from the mud enhancer supply pipe,
The excavated earth and sand on the face is excavated and filled into the excavation chamber 15, where it becomes consolidated. As a result, a force that prevents the eruption of other mountains always acts on the face. When a plurality of sets of elastic telescoping pumps 16, 16, . Because it ejects into the cut chamber,
The entire earth and sand within the excavation chamber 15 is circulated and stirred in a fluid state. Moreover, the elastic telescopic pump 16 is
As already explained in Figure 4, since the two valves open and close, even coarse gravel can be easily crushed, and the earth pressure at the face can be easily managed and earth eruptions can be prevented. can.

At this time, as shown in Figure 2, if a mud enhancer supply hole 20 is provided in a part of the circulation path and the mud enhancer is supplied according to the degree of dryness of the soil, the flow state of the soil can be further improved. get well.

The excavated soil fluidized and stirred in this manner is discharged outside the mine by the elastic extensible tube pump 17.

It should be noted that the present invention is not limited to the above example L-, and may of course be modified as appropriate. For example, in the above embodiment, the excavated earth and sand in the excavation chamber 15 is fluidized and agitated by the elastic extensible pump 16, but a normal pump may be used instead of the elastic extensible pump 16.

Further, in the embodiment described above, the earth in the excavation chamber 15 is removed by the elastic extensible pump 17, but instead of this, a scree conveyor or a ribbon screw conveyor may be used. In addition, it is possible to implement not only the mud odor type shield but also the muddy water type and the earth pressure balance type.

〔Effect of the invention〕

According to the present invention, the entire earth and sand in the excavation chamber is circulated, which improves the fluidity of the earth and sand, making it easier to carry out the earth and sand. In addition, by using an elastic telescopic pump, it is possible to circulate even coarse gravel, and since the pump applies pressure and blows out the gravel into the chamber, there is no possibility of dirt adhering to the cutter part or the chamber wall. . Furthermore, by forcibly mixing the mud enhancer with an agitation device, any kind of soil can be transported through pipes (fluid transport), and since excavation and soil can be carried out reliably, the propulsion of shields, etc. can be controlled and controlled. can be managed freely and excavation can be carried out safely.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the excavated soil flow agitation device according to the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is a cross-sectional view taken along line B-B in FIG. FIG. 4 is a diagram showing the principle of an elastic extensible tube pump used in an earth removal device. DESCRIPTION OF SYMBOLS 1...Hydraulic cylinder, 2.3...Elastic expansion pipe, 4°5...Valve, 6...Storage chamber, 10...Shield device, 11...Electric motor, 12... Rotating plate, 13...Drilling cutter, 14...Blocking wall, 15
...Drilling chamber, 16. 17. Elastic telescopic tube pump, 18. Mud enrichment supply pipe, 20. Mud enrichment supply hole.

Claims (3)

[Claims] (1) An excavation chamber is formed between the cutter for excavation and a cutoff wall that blocks the face and the underground, and a plurality of pumps are disposed on the cutoff wall, and the pumps pump excavated earth and sand in the excavation chamber. An excavated soil flow stirring device for the shield construction method, which is characterized by stirring in a fluid state. (2) The excavated soil flow agitation device in the shield construction method according to claim 1, characterized in that a supply hole for supplying a mud enhancer is provided in the circulation path of the pump. (3) The excavated soil flow agitation device in the shield construction method according to claim 1 or 2, characterized in that an elastic extensible pump is used as the pump.